PT-2020-8446 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2026-01-17 · CVE-2017-18900

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: Mattermost Server versions prior to 4.1.0 Mattermost Server version 4.0.4 and earlier Mattermost Server version 3.10.3 and earlier

Description: An issue allows CSV injection via a compliance report.

Recommendations: For versions prior to 4.1.0, update to version 4.1.0 or later. For version 4.0.4 and earlier, update to version 4.0.5 or later, or apply the fix from version 4.1.0. For version 3.10.3 and earlier, update to version 3.10.4 or later, or apply the fix from version 4.1.0.

Fix

RCE

Special Elements Injection

Weakness Enumeration

CWE-1236

CWE-74

Related Identifiers

CVE-2017-18900

GHSA-8Q4V-35V6-G8WR

GO-2026-4303

SUSE-SU-2026:0142-1

Affected Products

Mattermost Server

References · 42

• https://osv.dev/vulnerability/GHSA-8q4v-35v6-g8wr · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2017-18900 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-18900 · Security Note
• https://osv.dev/vulnerability/GO-2026-4303 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0142-1 · Vendor Advisory
• https://mattermost.com/security-updates · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://github.com/mattermost/mattermost/commit/eaa598aba901a20c65c52dd1e1b82e7e1dffb962 · Note
• https://suse.com/security/cve/CVE-2026-22688 · Note
• https://suse.com/security/cve/CVE-2026-21859 · Note
• https://suse.com/support/update/announcement/2026/suse-su-20260142-1 · Note
• https://suse.com/security/cve/CVE-2026-22703 · Note
• https://suse.com/security/cve/CVE-2025-68954 · Note
• https://suse.com/security/cve/CVE-2017-18905 · Note
• https://suse.com/security/cve/CVE-2017-18897 · Note